Irritating dry cough, also known as spasmodic cough, or airway spasm, is mostly accompanied by no or very little sputum and is not easy to cough up. The main causes are bronchitis, acute pharyngitis, allergic rhinitis, cough variant asthma, lung cancer and other diseases. 1. Dry cough caused by tracheitis and bronchitis. Bacteria, viruses, mycoplasma and other pathogens invade, causing inflammation of the trachea and bronchial tubes, triggering dry cough symptoms; 2. Acute and chronic pharyngitis. The patient’s throat mucosal congestion and even edema symptoms, and there is a foreign body sensation, stimulation of the laryngeal nerve triggered by a dry cough, there may also be symptoms of dyspnea. 3. Allergic rhinitis. Allergic rhinitis triggered by paroxysmal dry cough, especially in the inhalation of irritating gases, pollen, dust, mites when the cough is more serious. Patients take oral loratadine capsules, choose budesonide nasal spray, or use nebulized inhalation treatment. 4. Cough variant asthma: dry cough can be the only symptom, sensitive to cold air, irritating odor, pollen, etc. Symptoms can be aggravated at night, lung function bronchial excitation test is positive, bronchodilator and glucocorticoid treatment is effective. 5. Lung cancer: In early stage of lung cancer, irritating dry cough may appear, accompanied by symptoms such as emaciation, blood sputum, chest pain, etc. Occupying shadow can be seen in chest CT. Stimulating dry cough may also be seen in other diseases, such as gastroesophageal reflux stimulation, viral infection, mycoplasma infection, interstitial pneumonia, etc. It is recommended to consult doctor in time and standardize the treatment under the guidance of specialists.